The **M24C64-RMB3TPA** is a high-performance, low-voltage Electrically Erasable Programmable Read-Only Memory (EEPROM) manufactured by **STMicroelectronics**. It is widely used for parameter storage in mobile devices, consumer electronics, and industrial modules. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8,192 x 8 bits) | | **Interface** | I²C (Two-Wire Serial) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode) or 1 MHz (Fast Mode Plus) | | **Page Size** | 32 Bytes | | **Write Cycles** | 4 Million (at 25°C) | | **Data Retention** | 200 Years | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | --- ### 2. Functional Description The device operates as a "Slave" on the I²C bus. It utilizes a serial clock (SCL) and a bidirectional serial data (SDA) line. * **Memory Architecture:** The 64 Kbits are organized as 8,192 bytes. It supports both **Byte Write** and **Page Write** (up to 32 bytes at once). * **Write Protection:** Includes a hardware Write Control (WC) pin. If connected to $V_{CC}$, the entire memory becomes write-protected (read-only). * **Device Addressing:** The first byte sent after a Start condition includes a 4-bit fixed code (`1010`), followed by 3 device select bits ($E_2, E_1, E_0$), allowing up to 8 such devices on the same bus. --- ### 3. Pinout Configuration (UFDFPN8) | Pin Name | Function | | :--- | :--- | | **E0, E1, E2** | Chip Enable inputs (Address inputs) | | **SDA** | Serial Data (bidirectional) | | **SCL** | Serial Clock | | **WC** | Write Control (Input) | | **Vcc** | Supply Voltage | | **Vss** | Ground | --- ### 4. Part Number Breakdown: `M24C64-RMB3TPA` * **M24**: I²C Serial Access EEPROM. * **C64**: 64 Kbit density. * **-R**: Operating Voltage 1.8V to 5.5V. * **MB**: UFDFPN8 package (MLP8). * **3**: Range 3 temperature ($–40$ to $+125$ °C). * **T**: Tape and Reel packing. * **P/A**: Process or specific manufacturing code (RoHS compliant). --- ### 5. Implementation Example Below is a conceptual example of how to initialize a write command in C for an MCU: ```c // Example: Writing one byte to address 0x0010 void EEPROM_Write_Byte(uint16_t memAddress, uint8_t data) { I2C_Start(); I2C_Send_Byte(0xA0); // Device Address + Write Bit I2C_Send_Byte(memAddress >> 8); // High Address Byte I2C_Send_Byte(memAddress & 0xFF); // Low Address Byte I2C_Send_Byte(data); // Data to store I2C_Stop(); Delay_ms(5); // Wait for internal write cycle (tW) } ``` ---